Quite randomly, Rainbow Dash finds a journal of a mare and her brother, which she sees simply as a fictional story. However, on day, that mare comes to Ponyville. Not only that, but she and her sibling are not alone.

Memory makes up who a pony is. I used to be a unicorn named Twilight Sparkle. Now? I have no clue.

Fluffy bunnies are fluffy. Ranbow Dash doesn't realize how fluffy bunnies are.